Water-meter.



No. 673,173. Patented Apr. 30, I90l.

L. H. NASH.

WATER METER.

(Application Bled Feb. 15, 1900.) (No Model.) v 2 Shoah-Sheet l.

No. 673,173. y Patented Apr. 3o, |901.

L. H. NASH.

WATER METER.

(Application led Feb. 15, 1900.)

l (No Model.) 2 Sheets-Sheet 2.

mvENToR WITNESSES Y E $6 RJUARNEYS- UNTTE. STATES PATENT trice.

LEVISH. NASH, OF SOUTH NORWALK, CONNECTICUT.

` i WATER-METER.

SPECIFICATION forming. part of Letters Patent No. 673,173, dated April3C, 1901`.

` Application filed February l5, 1900. Serial No. 5,351. (No handel.;

T0 @ZZ whom, it may concern:

Be it known that l, LEWIS H.'NASH, a citizen of the United States, and aresident of South Norwalk, in the county of Fai riield and State ofConnecticut, have invented a new and Improved Water-Meter, of which thefollowing is a full, clear, and exact description.

' My invention relates to that class of watermeters known as oscillatingmeters of the general type shown, for example, in Letters Patent Nos.300,629 and 300,630, granted to me June 17, 1884; and it consists ofcertain `novel parts and combinations of parts specifically pointed outin the claims concluding this specification.

Reference is to be had to the accompanying.

stood that various modifications and changes may be made withoutchanging the nature of the invention and without exceeding the scope ofthe claims. This meter contains in common with other meters of thisclass, as those shown in said patents, a casing composed of a ringA,heads B and C, having an inlet-port. E and an outlet-port F, an interiorabutment B C', a diaphragm G, and a tubular piston D, workin g withinsaid casing. The tube D,form ing the piston, is provided with a centralweb or disk D', in the usual manner, and this web carries a pin K, whichis constrained to move in a circle by the roller L, journaled upon acentral pin B2 upon the lower head, all as' shown in the above-mentionedpatents. The movement of the piston is communicated to the registeringmechanism by means of the upward extension of the pin on which theroller K is journaled, the same contacting with a horizontal arm on thespindle connected with the registering mechanism, (not showin) all inthe usual way. The construction of the ports., however, differmaterially -from that shown in my said patents. The theoretical maximumarea of ports which might be used in this meter, allowing for a slightlap, is shown by the dotted lines E' and F. It will be noticed bycomparison of the outline of the ports shown with these dotted linesthat the inlet-port E is reduced in width from this maximum at the endnear the diaphragm or that portion of the port which would bein useduring the beginning of the inflow of water to the chambers formedbetween the piston and the walls A and B' of the casing. As aconsequence ot' this, when the port begins to open for the inflow ofwater its area is relatively restricted-that is, the area of the portrelative to the rate of increase in volume of the inlet-chamber issmaller at this point than itislater, as can be seen from an inspectionof Fig. 3, with reference to theinnerinletorfilliugchamberH. Thesamecondition occurs in connection with the filling 'of the outer inlet orfilling chamber H'. As the piston swings or moves to later positions theeective area of the inlet-port l-I increases fasterrthan the volume ofthe chamber, so that the pressure in the inlet-chamber rises as thepiston passes through its successive phases. In the position of thepiston shown in Fig. 3 the portfor the inlet-chamber H has not'yet beenuncovered and the chamber is beginning to enlarge. The only inlet forwater thereto is by leakage past the joints, which results in a veryslight pressure within the inner chamber H. At the same time theinlet-port for the outer chamber H is relatively large and the pressuretherein is substantially equal to that of the supply. The conditions arereversed on the outlet side, Where auxiliary ports are provided next tothe diaphragm G, so as to relatively increase the eective area of theport during the latter part of the discharge from eachdischarging-chamber. This is done by forming a notch or recess in thecentral abutment B and by providing aport through the outer wall A nextto the diaphragm and opening into the discharge-passage J. The'outlet-ports for the discharge chambers I and I are relatively large,being augmented next to the diaphragm by the auxiliary passages fand fwhich reduce the pressure in these chambers when approaching zero. Itwill be observed that I have also IOO , chamber.

y away from these walls.

improvements the piston is relieved of excessof construction theinlet-port open at the lat-v ter part of the filling period of a chamber(see Fig. 4) is larger than the outlet-port open at the early part ofthe discharge period of a (See Fig. 3.) As a result of these facts thepiston D is held in close cont-act with the two Walls A and B of thecasing, so

las to secure a tight joint and prevent leakage. It will be seen that asa result of the construction described the resultant pressure of theWater upon the piston acts to hold the piston tightly against the Wallsof the case to prevent leakage instead of holding it off o r As a resultof these ive strains and friction and in consequence Works ymore freelyand accurately and is more enduring. It is further t0 be observed thatif in any position of the piston the pressures present on inlet oroutlet side tend to lift the piston out of contact these can bediminished or neutralized by cutting paths for the water through theWall of the piston or in theheadplates c ornmunicating betweeninlet-chambers, respectively, or between outlet-chambers, respectively,and that an unnecessary excess of pressure yin thev desired directionmay be diminished by the same expedient. h

In Fig. 2, which shows the meter in section, it is seen that there is aninner and an outer case, the inner case consisting of ring A and heads Band C, forming the measuring-chamber, and the outer case consisting ofthe case M and cap N. The water enters through the pipe connection m andis discharged 'through the pipe connection m. The `case M hasadependingi'ange terminating in an inward extension, forming a ledge O',upon which is placed a screen O, which may be of perforated metal, WovenWire, or other suit- 'able material. This screen is held in place bylegs b, which depend from the head B and engage thek top of the screento hold it down rupon the ledge O. A ring b may be attached to the lowerends of the legs b and extend partially or entirely about the circle ofthe case. This device serves as a cheap and easy means for holding thescreen in place. The inner case or measuring-chamber drops into positionin the outer case and is held in place bythe cap N, bearing upon thehead C. By removing the cap N the measuring-chamber and the screen maybereadily removed.

Having thus described my invention, I claim'as new and desire to secureby Letters Patentl. A meter having a tubular piston With a motion ofoscillation combined with a case having tubular Walls, an interiorabutment and a iXed diaphragm extending between .said abutment and case,said case being provided with ports, the outlet-port nearv saiddiaphragm being in width greater than the inlet-port near said diaphragmwhereby the effective port area ofthe outlet-port at the latter part ofthe discharge period of a chamber is greater than the eective port areaof vth'einlet-port at the early partof the iilling period of a chamber.

2. A meterhaving a tubular piston with a motion of oscillation combinedwith a case having tubular walls, an interior abutment and a fixeddiaphragm extending between said 4abutment and case, said case beingprovided with ports, the outlet-port being of less circumferentiallength than the inlet-port, .whereby the effective port area of theinletport at lthe latter part of the iilling period of O a chamber isgreater than the eective port area of Athe outlet-port atV the earlypart of `the discharge period of a chamber.

3. A meter having a tubularr piston with a motion of oscillationcombined with a case having tubular walls, arcentral abutment and a xeddiaphragm extending between said abutment and case, said c ase beingprovided with ports, the inlet-port beingless in radial Width andgreater in circumferential length than the outlet-port.

In testimony whereof I have signed my nameL in the presenceV of twosubscribing Witnesses.

LEWIS H. NASH.

Witnesses:

JOHN H. NoRRIs, HENRY O. SCHADE.`

